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Sight in i want to zero my 1894 in 357 mag. for 100yds but only have a range of 25 yds how high do i go at 25 yds

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Depends totally on the ammunition you use. It will be markedly different for a light loaded heavy bullet .38 special as compared to a fast light bullet .357. The difference could be measured in feet rather than inches at 100 yards.

There are several ballistics programs on the internet that will help you with this, but you need to know things like bullet speed, ballistic coefficient, distance, etc. to use them effectively. Something as simple as a call to the ammunition manufacturer could answer your question quickly. Just ask them the drop of the bullet at 25 and 100 yards and adjust your sights using that information.

Posted on Apr 19, 2014


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What is bullet drop at 100 and 300 yds. when zeroed in at 200yds.

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No, it means the retical (cross hairs) will move 1/4 in. at 100yds.for every click of the windage or elevation knob.

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The reticle on my ACOG 3.5x scope won't go down far enough sight in @ 100yds. It is 12" high at 100yds and the reticle is maxed out. What should I do?

this is not uncomon jack up the frount of the scope with a fuw strips of 35mm film if you can this will lower the point of aim a lot at 100yds,,,you may need to let off the screws and fit a thin washer/s under the scope to lift the frount up

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How to use the BDC on my rifle scope

  1. Step 1 Take a rifle with a properly installed BDC bullet drop compensating reticle to a rifle range. Using ear protection zero the scope reticle so that the point of impact corresponds to the center of the cross hairs at the distance you have selected - typically 100 or 200 yds.
  2. Step 2 Determine the trajectory of the specific cartridge you have selected. There are several ways to do this. Ammo manufacturers publish trajectory and wind drift information. There are web based ballistic calculators like which will tell you how much your bullet drops at known distances.
  3. Step 3 Scope manufacturers like Leupold can be a valuable source of information about their reticle: "Leupold® Ballistic Aiming System: Boone and Crockett Club® Big Game Reticle aiming system provides a series of additional aiming points to improve your ability to shoot accurately at longer ranges. Nikon2_bing.gif also provides good information suggesting the marks on their reticle be used for zero at 100yds followed by circles below representing 200, 300, 400 and 500 yds if the cartridge travels around 2800 ft per sec. Nikon suggests the center cross hair be zeroed at 200 yds for magnum calibers traveling around 3000 ft per sec. We understant that each variation of different bullet weight and powder charge changes trajectory and a scope manufacturer can not build a different reticle for each different cartridge made so practice on the range to determine how well the marks relate to the actual impact of where your bullet strikes at a know distance is important. The one thing that people using BDC scopes typically have problems with is that a BDC scope has the reticle in the second focal plane of the scope. If the reticle was in the first focal plane of the scope the reticle would look smaller on low powers like 3x and grow proportionately larger as the power increased to say 9x top power. The problem is that while the marks on the BDC reticle correspond accurately to the bullet drop at the know distances 200, 300yds etc. What happens when you lower the power from the scopes maximum power to any other lower power is the reticle stays the same size and the field of view within the scope increases which means that the distance between these marks on the BDC reticle no longer corresponds to the point where the bullet will strike. In short BDC reticles only work at the maximum power of the scope or at a set specific power. At all other powers these BDC reticles do not accurately represent where the bullet will strike.
  4. Step 4 The center X always remains the same. If you zero at 100 yards and you know that your bullet drops 8 inches at 300 yards you could forget about the BDC marks and hold the center X 8 inches high - that works at any power 3x or 9x and should be used at lower powers. If you zero the center crosshair at 100yds and have the BDC scope at the maximum power 9X then the first line or circle below the center X should be the mark you place on the center of the 200 yard target----- the bullet strike should hit the center. If by some chance you put the scope on 3x and placed that first mark below the center cross hair on that 200 yard target you would shoot over the top of the target. This is because as the power of the scope decreases the field of view increases the angle increase and gets wider. You can experiment with known power settings and see at a specific power say 3x what that first circle down corresponds to and make notes because at any set power what the marks correspond to will be repeatable.
I got this from a website, hope it helps.

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1 Answer

Siting in scope 2 ft hi at 25 yds no adjustment

well at 25ft you will run out of drop, its all down to how high the scope is above the barrel when its fitted to the rifle a 30-06 should be set up over 100 yds and shooting out that far it will be shooting low,,your rifle will shoot right out to 1000yds so you will get about 5ft drop out that far,,,and by the way,,,its very very dangers to discharge your rifle into a sand bag closer that 30 yds,, you may well get hit by a bit of the bullet jacket being striped off the bullet and coming back at you so done do it, right! shoot it over 100yds
however if its still shooting hight at say 50yds the only way to drop the point of aim is pack out the front of the scope mount with a strip of 35mm film slip it under the front ring (not the eye end) and sit the scope on it then do up the screws to nip it up this will lift up the front of the scope and it will shoot lower,,also if you were to put a strip under the eye end it razes the point of aim, i do this often for the members of my club on much biger rifles than 30-06's
and they dont drift or move off aim its a cheap fix, or you need a new mount?

Jan 07, 2010 | Centerpoint Technologies CenterPoint...

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I have a Tasco 460 Night Vision Scope that I cannot get to group such as even in a vise it is off at 100 yards apprximatly 2 feet all over the place. Can you help?

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grouping at 100 yds? its hard at 30 yds there for shooting at people realy not small things like rats i have 4 nv scopes none realy group like a telly sight the best one is an e rushion sight that is good but hitting a bunny in the head at 30yds is very hard however try fitting a small lazer or better still 2 of them set at a range of 100yds so the two points of light are then only one point of light and your bang on at 100yds if there two colours thats even better at you wil know how far or close you are to the target by how far out the two points of light are, but i would give up on hitting the bull every time with any nv sight test it to see if its floting about first also you never sead whats it fitted to?

Jan 01, 2010 | Optics

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